Will old X10 3-Way switches work with new Zigbee dimmers?

I am replacing my old X10 dimmers with GE Zigbee dimmers. I am wondering if the old X10 3-way slaves will work, or do I have to replace these slaves as well?

Do the old X10 slaves work by momentarily closing the two wire circuit?

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It is definitely a simple momentary contact switch. I do not know if it was NO or NC.

Knowing X10, they had to be NO. Surprisingly, among my 300 X-10 devices, I don't think I ever had any 3-way slaves. But I do have a typical toggle switch installed to serve as a 3-way slave for one of my Jasco (ZWave) in-wall switches, had them pretty sure that's how it behaves as well.